Calculate the exact amount of raw potatoes needed for your meal. Account for hunger level, potato type, and preparation waste.
Last updated: March 2026
Mashed potatoes are a staple side dish for Thanksgiving, holiday meals, and everyday dinners. The challenge is knowing exactly how many potatoes to buy without ending up with too much waste or not enough food.
The culinary standard is approximately 1/2 pound (8 ounces) of raw potatoes per person. This accounts for the fact that potatoes lose water weight during cooking and peeling. When you add butter, milk, and seasoning, this amount yields a satisfying side dish portion.
However, the amount varies based on type of potato (which affects peeling waste) and your guests' appetites. This calculator helps you be precise, accounting for all these variables so you buy exactly the right amount without guessing.
Standard USDA serving portions:
Scenario: Thanksgi ving dinner with 12 guests, normal appetite, using Russet potatoes
Yes! Prepare them up to 2 days in advance. Store in the refrigerator in an airtight container. Reheat on the stove or in a slow cooker with additional milk and butter to restore creamy texture.
Russets are ideal for fluffy, light mashed potatoes because they're starchy. Yukon Golds create creamy, buttery mashed potatoes due to higher fat content. Many chefs blend both varieties (50/50) for the best of both worlds.
Peeling after cooking (while still warm) prevents waterlogging and keeps potatoes fluffier. For red potatoes, you can leave skins on for texture and nutrition. Russets are typically peeled before cooking.
Over-working the potatoes develops starch and gluten, creating a gluey texture. Mix gently and just until combined. Don't use a food processor unless you want ultra-smooth. Hand-mashing is best.
A typical ratio is 1 lb cooked potatoes + 4 tbsp butter + 1/4 cup milk. Adjust to your preference. Add milk gradually—you can always add more, but you can't remove it. Warm milk/butter mixes in better than cold.
Yes, freeze in airtight containers for up to 3 months. Thaw overnight in the fridge and reheat slowly on the stove with extra milk/butter. Texture may be slightly less creamy than fresh.
Use them for potato pancakes, shepherd's pie, gnocchi, or mashed potato-loaded baked goods. Or fold into soups. Mashed potatoes are incredibly versatile! Keep refrigerated up to 5 days.
Potato peels and eyes account for 5-15% weight loss depending on variety. This calculator includes that so you buy enough raw potatoes to yield the desired cooked amount without running short.
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